Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 25 for “"low noise amplifiers"”.
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A Test and Characterisation Facility for Cryogenic Low Noise Amplifiers
… for testing and determining the equivalent noise temperature of a cryogenic LNA operating at a physical temperature of 20 K is selected and presented. This method was tested at the Klerefontein support base and the measurements allowed conclusions to be drawn that show that the uncertainty …
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Millimeter-wave low-noise amplifiers using cost-effective ion-implanted MESFETs and coplanar transmission lines
… design and implementation of a monolithic 38 GHz low-noise amplifier using 0.25 $\mu$m ion-implanted GaAs MESFETs and coplanar waveguide transmission lines. It describes the development of low-noise GaAs FETs, measurement and modeling of active and passive components, circuit design, simulation, …
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Analysis and design of low-noise amplifiers in silicon-germanium hetrojunction bipolar technology for radar and communication systems
… Hetro-Junction Bipolar Transistor (SiGe HBT) low-noise amplifiers (LNAs). The LNA design trade-off space is presented and methods for achieving an optimized design are discussed. In Chapter 1, we review the importance of LNAs and the benefits of SiGe HBT technology in high frequency amplifier …
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Multiband RF/Microwave Front-end Receiver Design for Multi-Standard Applications
… new standards, multi-standard transceivers with low cost, low power, and high integrity start to receive more attention in recent years. As the number of operating frequency bands increases, the number of external filters and low-noise amplifiers in a commonly used multi-standard receiver with …
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Low noise microwave feedback amplifier design with simultaneous signal and noise matching
… into the problem of simultaneous signal and noise match at the input port of low noise amplifiers; feedback LNAs are considered because previous works show that they can achieve the simultaneous match condition. The investigation analyses the influence of both parallel and series feedback …
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Circuit modeling and optimization techniques for next-generation radar.
… thesis presents a new method to model wideband low-noise amplifiers for use in receiver circuits using the Volterra Series. Both of these contributions are expected to enhance design and implementation of future radar systems.
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Modeling and Design of a Three-dimensional Inductor with Magnetic Core
… one such passive device that is widely used in low noise amplifiers, oscillators, etc. Current on-chip spiral inductors suffer from large parasitics and area for a meager value of inductance and quality factor. The need to overcome these issues has led to the development inductors with new …
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A Power Constrained 433-MHz Low Noise Amplifier
<p>Within wireless communication systems, low noise amplifiers are critical for the performance of receivers. They are primarily responsible for providing enough gain while adding little noise to overcome the noise of the subsequent stages. The LNA presented here is part of a battery-powered …
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Drifting -Dipole Noise Model of Nanometer MOSFETs for Radio Frequency Integrated Circuit Design
… under equilibrium condition, and the thermal noise theory is no longer applicable to predicting its performance. This work describes a new noise formulation that takes into account high-field effects by using the concept of unrelaxable drifting dipoles. The proposed noise model is verified for …
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Terahertz imaging arrays for room temperature operation summary of doctoral thesis /
… These bow-tie sensor arrays with integrated low noise amplifiers have been applied for parallel signal read out in order to shorten THz imaging time. Developed diffractive optics components, which have a sharp focusing performance and advantage of high selectivity in a frequency scale, let to …
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On-chip Spiral Inductor/transformer Design And Modeling For Rf Applications
… frequently in radio frequency (RF) IC's such as low-noise amplifiers and oscillators. High performance inductor has become one of the critical components for voltage controlled oscillator (VCO) design, for its quality factor (Q) value directly affects the VCO phase noise. The optimization of …
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Circuit design and technological limitations of silicon RFICs for wireless applications
… methods of implementing RF circuits which allow the performance to be dynamically tuned to match real-time conditions in a power-efficient manner, and 2) refining approaches for thinking about the optimization of RF circuits at the device level. Working toward a 5.8 GHz receiver consistent …
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Drifting-dipole noise model of nanometer MOSFETs for radio frequency integrated circuit design
… and opened a new era of high performance, low cost system-on-chip (SOC) designs for multi-gigabit-per-second wireless communication. However, such achievements also bring new challenges, particularly in modeling the physical behaviors of these super-scaled devices. Among these issues, it is …
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Digital CMOS Design for Ultra Wideband Communication Systems: from Circuit-Level Low Noise Amplifier Implementation to a System-Level Architecture
… of ultra wideband (UWB) radios due to its low power and low cost. In addition to CMOS implementation, UWB radios would also significantly benefit from a radio architecture that enables digital communications. In addition to the normal challenges of CMOS RFIC design, there are two major …
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A Fully Monolithic 2.5 GHz LC Voltage Controlled Oscillator in 0.35 μm CMOS Technology
… wireless products that are cheaper, smaller, and lower power. Recently there has been an increased interest in using CMOS, a traditional digital and low frequency analog IC technology, to implement RF components such as mixers, voltage controlled oscillators (VCOs), and low noise amplifiers …
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Microwave CMOS VCOs and Front-Ends - using integrated passives on-chip and on-carrier
… is focused on receiver front-ends composed of Low Noise Amplifiers (LNAs), Mixers, and Voltage Controlled Oscillators (VCOs) operating at microwave frequencies. Traditionally, microwave electronics has used exclusive and more expensive semiconductor technologies (III-V materials). However, the …
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Physics of Superconducting Travelling-Wave Parametric Amplifiers
Superconducting travelling-wave parametric amplifiers (TWPAs) are ultra-low-noise amplifiers that achieve amplification through the nonlinear kinetic inductance of superconductors. These devices can have near quantum-limited noise performance, and have important applications in quantum information …
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Modeling gallium-nitride based high electron Mobility transistors : linking device physics to high voltage and high frequency circuit design
… in converters and active components of RF-power amplifiers. Designing circuits in both application regimes requires accurate compact device models that are grounded in physics and can describe the non-linear terminal characteristics. Currently available compact models for HEMTs are empirical and …
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Amplifier Architectures for Wireless Communication Systems
… of RF transmitters and receivers, namely amplifiers. On the transmitter side, enhanced efficiency and broader bandwidth over single and multiple bands on power amplifiers will help to have superior performance in communication systems. On the other hand, for the receiver side, having low …
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